<template>
  <div class="xtx-cart-page">
    <div class="container">
      <div class="cart">
        <table>
          <thead>
            <tr>
              <th width="120"><XtxCheckbox :model-value="allSelected" @change="allCheck">全选</XtxCheckbox></th>
              <th width="400">商品信息</th>
              <th width="220">单价</th>
              <th width="180">数量</th>
              <th width="180">小计</th>
              <th width="140">操作</th>
            </tr>
          </thead>
          <!-- 有效商品 -->
          <tbody>
            <tr v-for="i in list" :key="i">
              <!-- 单选框 -->
              <td><XtxCheckbox :model-value="i.selected" @change="(selected) => checkChange(i, selected)"/></td>
              <td>
                <div class="goods">
                  <RouterLink to="/"><img :src="i.picture" alt=""></RouterLink>
                  <div>
                    <p class="name ellipsis">{{i.name}}</p>
                  </div>
                </div>
              </td>
              <td class="tc">
                <p>&yen;{{i.nowOriginalPrice}}</p>
                <p>比加入时降价 <span class="red">&yen;{{i.price - i.nowPrice}}</span></p>
              </td>
              <td class="tc">
                <XtxNumBox :is-label="false" :model-value="i.count" @change="(num) => numChange(i, num)"/>
              </td>
              <td class="tc"><p class="f16 red">&yen;{{(i.nowOriginalPrice * i.count).toFixed(2)}}</p></td>
              <td class="tc">
                <p><a class="green" href="javascript:;" @click="delCart(i.skuId)">删除</a></p>
              </td>
            </tr>
          </tbody>
        </table>
      </div>
      <!-- 操作栏 -->
      <div class="action">
        <div class="batch">
          共 {{allCount}} 件商品，已选择 {{selectedCount}} 件，商品合计：
          <span class="red">¥{{selectedPrice.toFixed(2)}}</span>
        </div>
        <div class="total">
          <XtxButton type="primary" @click="buildOrder">下单结算</XtxButton>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import { computed } from 'vue'
import { useStore } from 'vuex'
import Message from '@/components/Message/index.js'
import router from '@/router'
export default {
  name: 'XtxCartPage',
  setup () {
    const store = useStore()
    // 单选
    function checkChange (curItem, selected) {
      console.log(curItem, selected)
      // 去vuex state list找到当前需要修改的这项数据  然后通过调用mutation函数
      // 把它里面的seleted这个属性 变成 最新拿到的状态

      // 问题：如何在自定义事件绑定的回调中除了拿到正常抛出的数据 再加一个id额外的参数？？
      // store.commit('cart/setSelected', { curItem, selected })
      store.dispatch('cart/asyncCheck', {
        skuId: curItem.skuId,
        count: curItem.count,
        selected
      })
    }

    // 全选
    function allCheck (seleted) {
      console.log(seleted)
      store.dispatch('cart/allCheck', seleted)
    }

    // 数量修改
    function numChange (curItem, count) {
      console.log(curItem, count)
      // 触发action函数  调用后端接口进行数据更新购物车列表
      store.dispatch('cart/asyncChangeNum', {
        skuId: curItem.skuId,
        selected: curItem.selected,
        count
      })
    }

    // 删除购物车
    function delCart (skuId) {
      // action函数
      store.dispatch('cart/asyncDelCart', [skuId])
    }
    // 计算属性返回值也是一个ref对象
    const selectedCount = computed(() => store.getters['cart/selectedCount'])
    // 生成订单信息
    function buildOrder () {
      // 是否有token
      // 判断用户是否有要结算的商品
      if (selectedCount.value > 0) {
        // 下单结算
        router.push('/settle')
      } else {
        Message({ text: '请先选中商品', type: 'warn' })
      }
    }
    return {
      list: computed(() => store.state.cart.list),
      allCount: computed(() => store.getters['cart/allCount']),
      selectedCount,
      selectedPrice: computed(() => store.getters['cart/selectedPrice']),
      allSelected: computed(() => store.getters['cart/allSelected']),
      checkChange,
      allCheck,
      numChange,
      delCart,
      buildOrder
    }
  }
}
</script>
<style scoped lang="less">
.tc {
  text-align: center;
  .xtx-numbox {
    margin: 0 auto;
    width: 120px;
  }
}
.red {
  color: @priceColor;
}
.green {
  color: @xtxColor
}
.f16 {
  font-size: 16px;
}
.goods {
  display: flex;
  align-items: center;
  img {
    width: 100px;
    height: 100px;
  }
  > div {
    width: 280px;
    font-size: 16px;
    padding-left: 10px;
    .attr {
      font-size: 14px;
      color: #999;
    }
  }
}
.action {
  display: flex;
  background: #fff;
  margin-top: 20px;
  height: 80px;
  align-items: center;
  font-size: 16px;
  justify-content: space-between;
  padding: 0 30px;
  .xtx-checkbox {
    color: #999;
  }
  .batch {
    a {
      margin-left: 20px;
    }
  }
  .red {
    font-size: 18px;
    margin-right: 20px;
    font-weight: bold;
  }
}
.tit {
  color: #666;
  font-size: 16px;
  font-weight: normal;
  line-height: 50px;
}
.xtx-cart-page {
  .cart {
    background: #fff;
    color: #666;
    table {
      border-spacing: 0;
      border-collapse: collapse;
      line-height: 24px;
      th,td{
        padding: 10px;
        border-bottom: 1px solid #f5f5f5;
        &:first-child {
          text-align: left;
          padding-left: 30px;
          color: #999;
        }
      }
      th {
        font-size: 16px;
        font-weight: normal;
        line-height: 50px;
      }
    }
  }
}
</style>
